<template>
    <div>
        <!-- 面包屑 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 面包屑 -->

        <!-- 卡片试图 -->
        <el-card>
            <!-- 警告区域 -->
            <el-alert show-icon title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false" ></el-alert>
            
            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类：</span>

                    <!-- 选择商品分类的级联选择框 -->
                     <el-cascader
                     expand-trigger="hover"
                     v-model="selectedCateKeys"
                    :options="catelist"
                    :props="cateProps"
                    @change="handleChange">
                    </el-cascader>

                </el-col>
            </el-row>

            <!-- tab 页签区域 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <!-- 添加参数按钮 -->
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand" >
                        <template slot-scope="scope">
                            <!-- 循环渲染Tag标签 -->
                            <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">
                                {{item}}
                            </el-tag>
                            <!-- 输入的文本框 -->
                            <el-input
                            class="input-new-tag"
                            v-if="scope.row.inputVisible"
                            v-model="scope.row.inputValue"
                            ref="saveTagInput"
                            size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)"
                            >
                            </el-input>
                            <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>


                        </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index" label="#"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>


                </el-tab-pane>
                <!-- 添加静态属性的面板 -->
                <el-tab-pane label="静态参数" name="only">
                    <!-- 添加属性按钮 -->
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
                    <!-- 静态属性表格 -->
                    <el-table :data="onIyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand" >
                        <template slot-scope="scope">
                            <!-- 循环渲染Tag标签 -->
                            <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">
                                {{item}}
                            </el-tag>
                            <!-- 输入的文本框 -->
                            <el-input
                            class="input-new-tag"
                            v-if="scope.row.inputVisible"
                            v-model="scope.row.inputValue"
                            ref="saveTagInput"
                            size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)"
                            >
                            </el-input>
                            <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>


                        </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index" label="#"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>


                </el-tab-pane>
            </el-tabs>

        </el-card>







    <!-- 添加参数的对话框 -->
        <el-dialog
        :title="'添加'+titleText"
        :visible.sync="addDialogVisible"
        width="50%"
        @close="addDialogClosed"
        >
        
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" >
            <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
        </el-form>

        <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
        </el-dialog>
    <!-- 添加参数的对话框 -->

    <!-- 修改参数的对话框 -->
        <el-dialog
        :title="'修改'+titleText"
        :visible.sync="editDialogVisible"
        width="50%"
        @close="editDialogClosed"
        >
        
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px" >
            <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
        </el-form>

        <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
        </el-dialog>
    <!-- 修改参数的对话框 -->


    </div>
</template>



<script>
export default {
        data(){
            return{
                //商品分类列表
                catelist:[],
                //级联选择框的配置对象
                cateProps:{
                    value:'cat_id',
                    label:'cat_name',
                    children:'children'
                },
                ///级联选择框双向绑定的数组
                selectedCateKeys:[],
                //被激活的页签的名称
                activeName:'many',
                //动态参数的数据
                manyTableData:[],
                //静态属性的数据
                onIyTableData:[],
                //控制条件对话框
                addDialogVisible:false,
                //添加参数的表单数据对象
                addForm:{
                    attr_name:''
                },
                //添加表单的验证规则对象
                addFormRules:{
                    attr_name:[{required:true,message:'请输入参数名称',trigger:'blur'}]    
                },
                //控制修改对话框的显示与隐藏
                editDialogVisible:false,
                //修改的表单数据对象
                editForm:{},
                //修改表单的验证规则对象
                editFormRules:{
                    attr_name:[{required:true,message:'请输入参数名称',trigger:'blur'}]    
                },
                //控制按钮与文本框的切换显示
                inputVisible:false,
                //文本框中输入的内容
                inputValue:''


            }
        },
        methods:{
            //获取所有的商品分类列表
            async getCateList(){
                const {data:res}=await this.$http.get('categories')
                if(res.meta.status!==200){
                    return this.$message.error('获取商品分类失败')
                }

                this.catelist=res.data.catelist
                console.log(this.catelist)
            },
            //级联选择框选中项变化，会触发这个函数
             handleChange(){
              
              this.getParamsData()
              
            },
            //tab 页签点击事件的处理函数
            handleTabClick(){
                console.log(this.activeName)
                this.getParamsData()
            },
            //获取参数的列表数据
            async getParamsData(){
                //证明选中的不是三级分类
                if(this.selectedCateKeys.length!==3){
                    this.selectedCateKeys=[]
                    this.manyTableData=[]
                    this.onIyTableData=[]
                    return
                }
                //证明选中的是三级分类
                console.log(this.selectedCateKeys)
                //根据所选分类的id,和当前所处的面板，获取对应的参数
                const {data:res} =await this.$http.get(`categories/${this.cateid}/attributes`,{params:{sel:this.activeName}})

                if(res.meta.status!==200){
                    return this.$message.error('获取参数列表失败')
                }
                
                
                res.data.forEach(item =>{
                   item.attr_vals=item.attr_vals?
                   item.attr_vals.split(' '):[]
                   //控制文本框的显示与隐藏
                   item.inputVisible=false
                   //文本框中输入的值
                   item.inputValue=''
                })

                
                console.log(res.data)
                if(this.activeName==='many'){
                    this.manyTableData= res.data
                }else{
                    this.onIyTableData= res.data
                }

            },
            //监听添加对话框的关闭事件
            addDialogClosed(){
                this.$refs.addFormRef.resetFields()
            },
            //点击按钮，添加参数
            addParams(){
                this.$refs.addFormRef.validate(async valid=>{
                    if(!valid) return

               const {data:res}=await this.$http.post(`categories/${this.cateid}/attributes`,{attr_name:this.addForm.attr_name,attr_sel:this.activeName,attr_vals:""})

                if(res.meta.status!==201){
                    return this.$$message.error('添加参数失败')
                }
                    this.$message.success('添加参数成功')
                    this.addDialogVisible=false
                    this.getParamsData()
                })
            },
            //点击按钮，展示修改的对话框
            async showEditDialog(attr_id){
                console.log(attr_id)
                //这是查询当前参数的数据
               const {data:res}= await this.$http.get(`categories/${this.cateid}/attributes/${attr_id}`,{params:{attr_sel:this.activeName}})

                if(res.meta.status!==200){
                    return this.$message.error('获取参数信息失败')
                }

                this.editForm=res.data

                this.editDialogVisible=true

            },
            //监听修改对话框的关闭事件
            editDialogClosed(){
                this.$refs.editFormRef.resetFields()
            },
            //点击按钮，修改参数信息
            editParams(){
                this.$refs.editFormRef.validate(async valid =>{
                    if(!valid) return 
                 const {data:res} = await this.$http.put(`categories/${this.cateid}/attributes/${this.editForm.attr_id}`
                    ,{attr_name:this.editForm.attr_name,attr_sel:this.activeName,attr_vals:" "})
                    
                    if(res.meta.status!==200){
                        return res.$message.error('修改参数失败')
                    }

                    this.$message.success('修改参数成功')
                    this.getParamsData()
                    this.editDialogVisible=false
                })

            },
            //根据id删除对应的参数
            async removeParams(attr_id){
                //弹框询问用户是否删除
                const confirmResult = await this.$confirm('此操作将永久删除该角色, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
                }).catch(err=> err)
                //如果用户点了确定删除，则返回值为字符串 confirm
                //如果用户点了取消删除，则返回值为字符串 cancel
                if(confirmResult !="confirm"){
                    return this.$message.info('已取消删除')
                }
                const {data:res} = await this.$http.delete(`categories/${this.cateid}/attributes/${attr_id}`)
                if(res.meta.status!==200){
                return this.$message.error('删除参数失败')
                }
                this.$message.success('删除参数成功')
                //重新获取用户列表的数据
                this.getParamsData();

            },
            //这是文本框失去焦点,或摁下了 Enter 都会触发 
            async handleInputConfirm(row){
                if(row.inputValue.trim().length===0){
                    row.inputValue=''
                    row.inputVisible=false
                    return
                }
                //如果没有return 则证明输入的内容，需要做后续处理
                row.attr_vals.push(row.inputValue.trim())
                row.inputValue=''
                row.inputVisible=false

                this.saveAttrVals(row)
                
                
            },
            //将对attr_vals 的操作，保存到数据库
            async saveAttrVals(row){               
                //需要发起请求，保存这次操作
                const {data:res} = await this.$http.put(`categories/${this.cateid}/attributes/${row.attr_id}`,
                {attr_name:row.attr_name,attr_sel:row.attr_sel,attr_vals:row.attr_vals.join(' ')})
                
                if(res.meta.status!=200){
                    return this.$message.error('修改参数项失败')
                }
                    this.$message.success('修改参数项成功')
            },
            //点击按钮，展示文本输入框
            showInput(row){
                console.log(row)
                row.inputVisible=true
                //让文本框自动获得焦点
                //$nextTick 方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
                this.$nextTick(_ => {
                    this.$refs.saveTagInput.$refs.input.focus();
                });
            },
            //删除对应的参数可选项
            handleClose(i,row){
                row.attr_vals.splice(i,1)
                this.saveAttrVals(row)
            }

        },
        created(){
            this.getCateList()
        },
        computed:{
            //如果按钮需要被禁止，则返回true，否则返回false
            isBtnDisabled(){
                if(this.selectedCateKeys.length!==3){
                    return true
                }
                return false
            },
            //当前选中的三级分类的id
            cateid(){
                if(this.selectedCateKeys.length===3){
                    return this.selectedCateKeys[2]
                }
                return null
            },
            //动态计算标题的文本
            titleText(){
                if(this.activeName==="many"){
                    return '动态参数'
                }
                return '静态属性'
            }


        }



}
</script>

<style lang="less" scoped>
.el-breadcrumb{
    margin-bottom: 15px;
    font-size: 12px;
}
.el-card{
    box-shadow: 0 1px 1px rgba(0, 0, 0, 0.15) !important;
}
.el-table{
    margin-top: 15px;
    font-size: 12px;
}
.cat_opt{
    margin: 15px 0;
}
.el-tag{
     margin:10px 0 10px 20px;
    // margin:7px;
}
.el-button{
    margin:10px;
}
.input-new-tag{
    margin:10px;
    width: 120px;
}

</style>